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Summary of Accounting Policies - Revenue Recognition (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Substrate sales revenue $ 1,934ten_SubstrateSaleRevenue $ 1,835ten_SubstrateSaleRevenue $ 1,660ten_SubstrateSaleRevenue